The most pleasant months of the year for Cynthiana are September, June and August. In Cynthiana, there are 5 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Cynthiana with an average high temperature of 84.1°, which ranks it as warmer than most places in Ohio. January is the snowiest month in Cynthiana with 5.9 inches of snow, and 4 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.